Add color scheme for iTerm2

Added basic color scheme for iTerm2:

![iTerm preview](https://www.evernote.com/shard/s78/sh/86d65a20-6f00-40a9-9228-da27cecd1a0d/6ae6e858509324769b7db60ad54c1fff/res/181abe69-fea6-4aab-acbb-feb909a94ad8/screenshot.png?resizeSmall&width=832)